At low powers, there is even a peculiar qualitative difference: for large enough noise levels from NG, the "blueside" peak in the spectrum even becomes negative:
from a sideband peak, the signal evolves towards a sideband dip. This is the so-called phenomenon of "noise squashing"
(when the destructive interference is even bigger than the Brownian noise level), already discussed in the literature within the quantum formalism [1]}, [2]}. This is represented as a grey
region in figs. REF  and REF .
